1. Department of Internal Medicine, Gelderse Vallei, Ede, the Netherlands
2. Department of Internal Medicine, Albert Schweitzer hospital, Dordrecht, the Netherlands
3. Department of Research and Development, Netherlands Comprehensive Cancer Organisation (IKNL), Utrecht, The Netherlands
4. Laboratory Medical Immunology, Department of Immunology, Erasmus MC, Rotterdam, The Netherlands
5. Department of Hematology, Maastricht UMC, the Netherlands Maastricht
6. Department of Internal Medicine, HAGA hospital, Den Haag, the Netherlands
7. Department of Hematology, UMC Utrecht, the Netherlands Utrecht
8. Department of Internal Medicine, St Jansdal hospital, Harderwijk, the Netherlands
9. Department of Internal Medicine, Catharina hospital, Eindhoven, the Netherlands
10. Department of Internal Medicine, Rijnstate, Arnhem, the Netherlands
11. Department of Internal Medicine, Reinier de Graaf hospital, Delft, the Netherlands
12. Department of Hematology, Leiden Univerisity Medical Center, Leiden, the Netherlands
13. Department of Internal Medicine, Noordwest ziekenhuisgroep, Alkmaar, the Netherlands
14. Department of Internal Medicine Amphia hospital, Breda, the Netherlands
15. Department of Internal Medicine, Flevo hospital, Almere, the Netherlands
16. Department of Hematology, Groningen University Medical Center, University of Groningen, Groningen, the Netherlands
17. Department of Hematology, Erasmus MC Cancer Institute, University Medical Center Rotterdam, Rotterdam, the Netherlands
18. Department of Hematology, Cancer Center Amsterdam, Lymphoma and Myeloma Center Amsterdam, Amsterdam UMC, Amsterdam, University of Amsterdam, Amsterdam, the Netherlands